How do I tell my gf she needs to shave that goddamn mustache hair in a way that won't hurt her,I mean I tried to be subtle but **** she isn't getting it. It's not a lot of hair but damn does it bother me

Talk to one of her friends, or your sister or her sister (anyone whose close to her and is a female) about the problem in a nice way. Maybe some female friend scould have a girls night with her and they could get rid of it as an "friendly gesture". "let's get super pretty!" etc..